<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>async函数</title>
</head>
<body>
    <script>
        async function main(){
            // return 521;
            return new Promise((resolve,reject)=>{
                // resolve('OK');
                // reject('ERROR');
                throw 'ERR';
            })
        };
        let result = main();
        console.log(result);

    </script>
    
</body>
</html>